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Texas Instruments LM2734XQMKE/NOPB
- Part No.:
- LM2734XQMKE/NOPB
- Manufacturer:
- Texas Instruments
- Package:
- SOT-23-6 Thin, TSOT-23-6
- Datasheet:
-
LM2734XQMKE/NOPB.pdf
- Description:
- IC REG BUCK ADJ 1A TSOT23-6
- Quantity:
- Payment:
- Shipping:
Inventory:691
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Product details
Overview
LM2734XQMKE/NOPB from Texas Instruments is an AEC-Q100 Grade 1 qualified, monolithic 1-A step-down DC/DC regulator IC in a Thin SOT-23-6 package. It operates from 3 V to 20 V input, delivers 0.8 V to 18 V output, switches at 1.6 MHz, integrates a 300 mΩ NMOS power switch, and features current-mode PWM control with internal compensation - used for local point-of-load regulation in automotive ADAS modules.
For engineers reviewing the LM2734XQMKE/NOPB datasheet, LM2734XQMKE/NOPB pinout, LM2734XQMKE/NOPB application, or LM2734XQMKE/NOPB equivalent, key selection criteria include its 1.6-MHz fixed switching frequency, 30-nA shutdown current, 0.8-V ±2% reference, thermal shutdown, and output overvoltage protection - all validated for -40°C to +125°C operation in safety-critical automotive systems.
Technical Context
The LM2734XQMKE/NOPB implements constant-frequency current-mode PWM control with internal slope compensation and a single-pole, single-zero compensated error amplifier. Its 1.6-MHz oscillator enables sub-100 ns minimum on-time (13 ns typical), supporting high VIN-to-VOUT conversion ratios down to 0.8 V while maintaining stability across 3–20 V input range.
It uses bootstrap gate drive (BOOST–SW ≥ 1.6 V) to fully enhance the integrated 300-mΩ NMOS switch, with cycle-by-cycle current limiting set at 1.7 A (typical) and thermal shutdown activation at 165°C junction temperature. Feedback is sensed at FB via resistor divider, referenced to a trimmed 0.8-V internal bandgap.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Switching Frequency | 1.6 MHz - enables use of ≤4.7 µH inductors and small ceramic capacitors, minimizing PCB footprint in space-constrained ADAS ECUs. |
| Output Current | 1 A continuous - supports powering microcontrollers, image sensors, or CAN transceivers directly from 12-V automotive rail. |
| Input Voltage Range | 3 V to 20 V - accommodates cold-crank (≥3 V) and load-dump (≤20 V) conditions per ISO 7637-2 without external protection. |
| Feedback Reference | 0.8 V ±2% - allows precise output setting (e.g., 1.5 V, 3.3 V, 5 V) with standard 1% resistors; line regulation <0.01%/V ensures stability during battery fluctuations. |
| Shutdown Current | 30 nA - enables ultra-low-power sleep modes in always-on vehicle networks without draining backup batteries. |
| RDS(ON) | 300 mΩ (typical) - limits conduction loss to <300 mW at 1 A, supporting >90% peak efficiency at 5 V→3.3 V conversion. |
| UVLO Threshold | 2.74 V (rising), 2.3 V (falling) with 440 mV hysteresis - prevents erratic startup during slow battery ramp-up and avoids brownout oscillation. |
Pinout & Package
LM2734XQMKE/NOPB is housed in a 6-pin Thin SOT-23-6 (DDC) package measuring 2.90 mm × 1.60 mm, optimized for thermal performance on 2-layer automotive PCBs with exposed pad grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BOOST (Pin 1) | Bootstrap supply input | Drives NMOS gate; requires 0.01 µF X7R capacitor to SW; must maintain ≥1.6 V above SW for full enhancement - critical for efficiency at low duty cycles. |
| GND (Pin 2) | Signal and power ground | Common return for feedback divider, input/output caps, and thermal path; bottom resistor of FB divider must connect here to minimize regulation error. |
| FB (Pin 3) | Voltage feedback input | Senses output via resistor divider; internal 0.8-V reference sets VOUT = 0.8 × (1 + R1/R2); bias current <250 nA minimizes divider error. |
| EN (Pin 4) | Enable control input | Logic-high (>1.8 V) enables regulation; logic-low (<0.4 V) disables with 30-nA quiescent draw; must not exceed VIN + 0.3 V. |
| VIN (Pin 5) | Main input supply | Accepts 3–20 V; requires local 10-µF ceramic bypass cap; UVLO circuit monitors this pin to prevent operation below 2.74 V. |
| SW (Pin 6) | Power switch node | Connects to inductor, catch diode cathode, and BOOST capacitor; swings from GND to VIN − ILOAD×RDS(ON); high dv/dt demands tight layout. |
Key Features
| Feature | Design Value |
|---|---|
| Current-mode PWM control | Enables fast transient response (<10 µs to settle ±2%) and inherent cycle-by-cycle current limiting without external sense resistor. |
| Internal soft-start | Ramps reference from 0 V to 0.8 V in ~200 µs, limiting inrush current into large output capacitance - prevents input rail collapse during ECU power-up. |
| Output overvoltage protection | Shuts off NMOS if FB exceeds 0.88 V (10% above reference), protecting downstream 3.3-V or 1.8-V logic from fault-induced overvoltage. |
| AEC-Q100 Grade 1 qualification | Validated for operation from –40°C to +125°C ambient, including HTOL, TC, and ESD testing - meets requirements for front-camera and radar modules. |
| Thermal shutdown | Disables switching at 165°C junction temperature and auto-restarts at ~150°C, preventing permanent damage during sustained overload or poor heatsinking. |
Applications
| Automotive Front Camera Module | ADAS Radar Power Supply |
|---|---|
Use Scenario: Powers 3.3-V image sensor and 1.2-V ISP in forward-facing camera ECU operating under engine bay temperature extremes. IC Role / Device Role / Timing Role: Primary point-of-load buck regulator delivering regulated 3.3 V/1 A and 1.2 V/0.5 A (via secondary LDO) from 12-V battery rail. Use Value: 1.6-MHz switching avoids AM radio band interference; 30-nA shutdown preserves battery during vehicle sleep mode; AEC-Q100 Grade 1 ensures reliability at 125°C ambient. |
Use Scenario: Supplies 5-V RF front-end and 1.8-V digital core in 77-GHz radar transceiver module exposed to under-hood thermal cycling. IC Role / Device Role / Timing Role: High-efficiency buck converter generating stable 5 V from noisy 12-V automotive supply, feeding low-noise LDOs for RF/analog sections. Use Value: 300-mΩ RDS(ON) and internal compensation reduce component count vs. controller+MOSFET solutions; thermal shutdown protects against enclosure overheating. |
| Infotainment System PMIC Sub-Block | Body Control Module (BCM) Microcontroller Core |
Use Scenario: Provides 1.1-V core voltage for ARM Cortex-A53 application processor in head-unit, requiring tight load regulation during video decode bursts. IC Role / Device Role / Timing Role: Secondary buck stage in multi-rail PMIC, stepping down 3.3-V intermediate rail to processor core voltage with dynamic voltage scaling support. Use Value: Current-mode control delivers <1% output deviation during 0–1-A load steps; 0.8-V reference enables accurate core voltage setting with 1% resistors. |
Use Scenario: Generates 3.3-V supply for 8-bit MCU and CAN transceiver in door module, operating continuously across vehicle lifetime. IC Role / Device Role / Timing Role: Standalone buck regulator replacing linear regulator to improve efficiency and reduce thermal stress in sealed plastic housing. Use Value: 90% peak efficiency eliminates need for heatsink; 2.74-V UVLO prevents MCU reset during cranking; Thin SOT-6 fits narrow PCB space behind door panel. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar step-down regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM2734YQMKE/NOPB | 550-kHz switching frequency; higher minimum on-time (≈35 ns); lower boost current demand (1.0–1.8 mA vs. 2.5–3.5 mA). | Better suited for higher output voltages (e.g., 5 V from 12 V) where larger inductors are acceptable; less sensitive to PCB layout parasitics. | Select LM2734YQMKE/NOPB when EMI filtering is prioritized over size, or when using >10-µH inductors to reduce ripple current. |
| TPS62130ARGTR | 3-MHz switching; 2-A output; integrated synchronous rectification; 17-µVRMS output noise; no external BOOST capacitor required. | Supports higher current and lower noise for DSP/FPGA rails; lacks AEC-Q100 qualification and automotive temp grade. | Choose TPS62130ARGTR for non-automotive industrial or consumer applications needing higher current or lower noise, but verify qualification status for automotive use. |
Compared with LM2734YQMKE/NOPB, the LM2734XQMKE/NOPB trades slightly higher boost current demand for 3× faster switching - enabling smaller passives and better transient response in compact ADAS designs. Versus TPS62130ARGTR, it offers automotive qualification and simpler external component count at the cost of lower current rating and asynchronous operation.
Availability
LM2734XQMKE/NOPB is available at Aetrix Electronics and suitable for automotive ADAS, infotainment power management, and body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM2734XQMKE/NOPB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader designing analog, embedded processing, and connectivity technologies for automotive, industrial, and personal electronics markets.
The LM2734XQMKE/NOPB belongs to TI's automotive-grade DC/DC regulator product line, engineered specifically for reliable, space-efficient point-of-load conversion in AEC-Q100-compliant vehicle subsystems - emphasizing thermal robustness, EMI control, and functional safety readiness.
FAQ
What is the maximum input voltage rating for the LM2734XQMKE/NOPB?
The LM2734XQMKE/NOPB has an absolute maximum input voltage (VIN) rating of 24 V, with recommended operating range from 3 V to 20 V. Exceeding 20 V risks violating safe operating area during load dump events unless external clamping is added; the 24-V limit is a stress rating only and not for continuous operation.
Does the LM2734XQMKE/NOPB require an external bootstrap capacitor?
Yes, the LM2734XQMKE/NOPB requires a 0.01-µF X7R ceramic capacitor between BOOST and SW pins to sustain gate drive for the internal NMOS switch. This capacitor is charged via an internal current source during startup and replenished each switching cycle - omission causes immediate dropout and thermal failure.
How does the LM2734XQMKE/NOPB handle overvoltage conditions on the output?
The LM2734XQMKE/NOPB includes dedicated output overvoltage protection: if the FB pin voltage exceeds 0.88 V (10% above its 0.8-V reference), the internal NMOS switch is immediately disabled to prevent damage to downstream 3.3-V or 1.8-V logic. Recovery occurs automatically once FB falls below threshold.
Can the LM2734XQMKE/NOPB be used without the EN pin connected?
No - the EN pin must be actively driven to a valid logic level. Leaving EN floating may cause erratic enable/disable behavior due to leakage currents; TI specifies that EN must be tied to VIN (for always-on) or controlled by a clean logic signal. Do not allow EN voltage to exceed VIN + 0.3 V.
What is the thermal resistance (RθJA) of the LM2734XQMKE/NOPB in its SOT-23-6 package?
The LM2734XQMKE/NOPB in the DDC (Thin SOT-23-6) package has a junction-to-ambient thermal resistance (RθJA) of 158.1°C/W under standard JEDEC test conditions. Actual board-level performance improves significantly with copper pour under the exposed pad and thermal vias - typical RθJB is 29.5°C/W.
LM2734XQMKE/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-23-6 Thin, TSOT-23-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 3V
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 0.8V
- Voltage - Output (Max):
- 18V
- Current - Output:
- 1A
- Frequency - Switching:
- 1.6MHz
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TSOT-23-6
LM2734XQMKE/NOPB FAQ
1.How can I place an order for LM2734XQMKE/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM2734XQMKE/NOPB on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for LM2734XQMKE/NOPB reliable?
The price and inventory of LM2734XQMKE/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM2734XQMKE/NOPB is usually 5 days.
3.What payment methods are accepted for LM2734XQMKE/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM2734XQMKE/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM2734XQMKE/NOPB?
LM2734XQMKE/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM2734XQMKE/NOPB order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for LM2734XQMKE/NOPB?
For technical support, including LM2734XQMKE/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM2734XQMKE/NOPB requirements.
6.How does Aetrix verify that LM2734XQMKE/NOPB is sourced from the original manufacturer or authorized distributors?
All LM2734XQMKE/NOPB products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LM2734XQMKE/NOPB meets industry standards.
7.What is the process for return or replacement of LM2734XQMKE/NOPB?
All LM2734XQMKE/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM2734XQMKE/NOPB, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The LM2734XQMKE/NOPB part is unused and in its original packaging.
Return procedure for LM2734XQMKE/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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